misc: add Qualcomm GENI SE QUP device driver

This change adds a Qualcomm GENI SE QUP device driver as a wrapper for
actually enabled and used serial devices found on a board.

At the moment the driver is pretty simple, its intention is to populate
childred devices and provide I/O mem read interface to them as clients,
this is needed for GENI UART driver to set up a proper clock divider
and provide the actually asked baud rate.

Signed-off-by: Vladimir Zapolskiy <vladimir.zapolskiy@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>

1 files changed, 41 insertions, 0 deletions

diff --git a/drivers/misc/qcom-geni-se.c b/drivers/misc/qcom-geni-se.c
new file mode 100644
index 00000000000..281a5ec819a
--- /dev/null
+++ b/drivers/misc/qcom-geni-se.c
@@ -0,0 +1,41 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Qualcomm Generic Interface (GENI) Serial Engine (SE) Wrapper
+ *
+ * Copyright (C) 2023 Linaro Ltd. <vladimir.zapolskiy@linaro.org>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <misc.h>
+#include <asm/io.h>
+
+static int geni_se_qup_read(struct udevice *dev, int offset,
+			    void *buf, int size)
+{
+	fdt_addr_t base = dev_read_addr(dev);
+
+	if (size != sizeof(u32))
+		return -EINVAL;
+
+	*(u32 *)buf = readl(base + offset);
+
+	return size;
+}
+
+static struct misc_ops geni_se_qup_ops = {
+	.read = geni_se_qup_read,
+};
+
+static const struct udevice_id geni_se_qup_ids[] = {
+	{ .compatible = "qcom,geni-se-qup" },
+	{}
+};
+
+U_BOOT_DRIVER(geni_se_qup) = {
+	.name = "geni_se_qup",
+	.id = UCLASS_MISC,
+	.of_match = geni_se_qup_ids,
+	.ops = &geni_se_qup_ops,
+	.flags  = DM_FLAG_PRE_RELOC,
+};